package com.ybw;


import com.alibaba.fastjson.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class MainController {
    public static void main(String[] args) {
        Map map=new HashMap();
        map.put(1, "a");
        map.put(2, "b");
        System.out.println(map.keySet());
        System.out.println(map.values());


    }
}
